]>
Commit | Line | Data |
---|---|---|
6fc6879b JM |
1 | /* |
2 | * WPA Supplicant - Scanning | |
2c09af30 | 3 | * Copyright (c) 2003-2012, Jouni Malinen <j@w1.fi> |
6fc6879b | 4 | * |
0f3d578e JM |
5 | * This software may be distributed under the terms of the BSD license. |
6 | * See README for more details. | |
6fc6879b JM |
7 | */ |
8 | ||
9ba9fa07 | 9 | #include "utils/includes.h" |
6fc6879b | 10 | |
9ba9fa07 JM |
11 | #include "utils/common.h" |
12 | #include "utils/eloop.h" | |
13 | #include "common/ieee802_11_defs.h" | |
66fe0f70 | 14 | #include "common/wpa_ctrl.h" |
6fc6879b JM |
15 | #include "config.h" |
16 | #include "wpa_supplicant_i.h" | |
2d5b792d | 17 | #include "driver_i.h" |
b01c18a8 | 18 | #include "wps_supplicant.h" |
0e65037c JM |
19 | #include "p2p_supplicant.h" |
20 | #include "p2p/p2p.h" | |
c923b8a5 | 21 | #include "hs20_supplicant.h" |
8bac466b | 22 | #include "notify.h" |
9ba9fa07 JM |
23 | #include "bss.h" |
24 | #include "scan.h" | |
6fc6879b JM |
25 | |
26 | ||
27 | static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s) | |
28 | { | |
29 | struct wpa_ssid *ssid; | |
30 | union wpa_event_data data; | |
31 | ||
32 | ssid = wpa_supplicant_get_ssid(wpa_s); | |
33 | if (ssid == NULL) | |
34 | return; | |
35 | ||
8bac466b | 36 | if (wpa_s->current_ssid == NULL) { |
6fc6879b | 37 | wpa_s->current_ssid = ssid; |
8bac466b JM |
38 | if (wpa_s->current_ssid != NULL) |
39 | wpas_notify_network_changed(wpa_s); | |
40 | } | |
6fc6879b | 41 | wpa_supplicant_initiate_eapol(wpa_s); |
f049052b BG |
42 | wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured " |
43 | "network - generating associated event"); | |
6fc6879b JM |
44 | os_memset(&data, 0, sizeof(data)); |
45 | wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data); | |
46 | } | |
47 | ||
48 | ||
ad08c363 | 49 | #ifdef CONFIG_WPS |
5f738a21 | 50 | static int wpas_wps_in_use(struct wpa_supplicant *wpa_s, |
f90c86d4 | 51 | enum wps_request_type *req_type) |
ad08c363 JM |
52 | { |
53 | struct wpa_ssid *ssid; | |
54 | int wps = 0; | |
ad08c363 | 55 | |
5f738a21 | 56 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { |
ad08c363 JM |
57 | if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS)) |
58 | continue; | |
59 | ||
60 | wps = 1; | |
b01c18a8 | 61 | *req_type = wpas_wps_get_req_type(ssid); |
ad08c363 JM |
62 | if (!ssid->eap.phase1) |
63 | continue; | |
64 | ||
ad08c363 JM |
65 | if (os_strstr(ssid->eap.phase1, "pbc=1")) |
66 | return 2; | |
67 | } | |
68 | ||
5f738a21 | 69 | #ifdef CONFIG_P2P |
7a808c7e JM |
70 | if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p && |
71 | !wpa_s->conf->p2p_disabled) { | |
b21ff9cb JM |
72 | wpa_s->wps->dev.p2p = 1; |
73 | if (!wps) { | |
74 | wps = 1; | |
75 | *req_type = WPS_REQ_ENROLLEE_INFO; | |
76 | } | |
5f738a21 LC |
77 | } |
78 | #endif /* CONFIG_P2P */ | |
79 | ||
ad08c363 JM |
80 | return wps; |
81 | } | |
82 | #endif /* CONFIG_WPS */ | |
83 | ||
e76baaac | 84 | |
2c09af30 JM |
85 | /** |
86 | * wpa_supplicant_enabled_networks - Check whether there are enabled networks | |
87 | * @wpa_s: Pointer to wpa_supplicant data | |
88 | * Returns: 0 if no networks are enabled, >0 if networks are enabled | |
89 | * | |
90 | * This function is used to figure out whether any networks (or Interworking | |
91 | * with enabled credentials and auto_interworking) are present in the current | |
92 | * configuration. | |
93 | */ | |
349493bd | 94 | int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s) |
e76baaac | 95 | { |
349493bd | 96 | struct wpa_ssid *ssid = wpa_s->conf->ssid; |
d4534bde | 97 | int count = 0, disabled = 0; |
e76baaac | 98 | while (ssid) { |
349493bd | 99 | if (!wpas_network_disabled(wpa_s, ssid)) |
5471c343 | 100 | count++; |
d4534bde JM |
101 | else |
102 | disabled++; | |
e76baaac JM |
103 | ssid = ssid->next; |
104 | } | |
4d5bda5f JM |
105 | if (wpa_s->conf->cred && wpa_s->conf->interworking && |
106 | wpa_s->conf->auto_interworking) | |
107 | count++; | |
d4534bde JM |
108 | if (count == 0 && disabled > 0) { |
109 | wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled " | |
110 | "networks)", disabled); | |
111 | } | |
5471c343 | 112 | return count; |
e76baaac JM |
113 | } |
114 | ||
115 | ||
116 | static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s, | |
117 | struct wpa_ssid *ssid) | |
118 | { | |
119 | while (ssid) { | |
349493bd | 120 | if (!wpas_network_disabled(wpa_s, ssid)) |
e76baaac JM |
121 | break; |
122 | ssid = ssid->next; | |
123 | } | |
124 | ||
125 | /* ap_scan=2 mode - try to associate with each SSID. */ | |
126 | if (ssid == NULL) { | |
f049052b BG |
127 | wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached " |
128 | "end of scan list - go back to beginning"); | |
ba2a573c | 129 | wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN; |
e76baaac JM |
130 | wpa_supplicant_req_scan(wpa_s, 0, 0); |
131 | return; | |
132 | } | |
133 | if (ssid->next) { | |
134 | /* Continue from the next SSID on the next attempt. */ | |
135 | wpa_s->prev_scan_ssid = ssid; | |
136 | } else { | |
137 | /* Start from the beginning of the SSID list. */ | |
ba2a573c | 138 | wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN; |
e76baaac JM |
139 | } |
140 | wpa_supplicant_associate(wpa_s, NULL, ssid); | |
141 | } | |
142 | ||
143 | ||
d3a98225 JM |
144 | static int int_array_len(const int *a) |
145 | { | |
146 | int i; | |
147 | for (i = 0; a && a[i]; i++) | |
148 | ; | |
149 | return i; | |
150 | } | |
151 | ||
152 | ||
153 | static void int_array_concat(int **res, const int *a) | |
154 | { | |
155 | int reslen, alen, i; | |
156 | int *n; | |
157 | ||
158 | reslen = int_array_len(*res); | |
159 | alen = int_array_len(a); | |
160 | ||
067ffa26 | 161 | n = os_realloc_array(*res, reslen + alen + 1, sizeof(int)); |
d3a98225 JM |
162 | if (n == NULL) { |
163 | os_free(*res); | |
164 | *res = NULL; | |
e6c0ebff | 165 | return; |
d3a98225 JM |
166 | } |
167 | for (i = 0; i <= alen; i++) | |
168 | n[reslen + i] = a[i]; | |
169 | *res = n; | |
170 | } | |
171 | ||
172 | ||
173 | static int freq_cmp(const void *a, const void *b) | |
174 | { | |
175 | int _a = *(int *) a; | |
176 | int _b = *(int *) b; | |
177 | ||
178 | if (_a == 0) | |
179 | return 1; | |
180 | if (_b == 0) | |
181 | return -1; | |
182 | return _a - _b; | |
183 | } | |
184 | ||
185 | ||
186 | static void int_array_sort_unique(int *a) | |
187 | { | |
188 | int alen; | |
189 | int i, j; | |
190 | ||
191 | if (a == NULL) | |
192 | return; | |
193 | ||
194 | alen = int_array_len(a); | |
195 | qsort(a, alen, sizeof(int), freq_cmp); | |
196 | ||
197 | i = 0; | |
198 | j = 1; | |
199 | while (a[i] && a[j]) { | |
200 | if (a[i] == a[j]) { | |
201 | j++; | |
202 | continue; | |
203 | } | |
204 | a[++i] = a[j++]; | |
205 | } | |
206 | if (a[i]) | |
207 | i++; | |
208 | a[i] = 0; | |
209 | } | |
210 | ||
211 | ||
2c09af30 JM |
212 | /** |
213 | * wpa_supplicant_trigger_scan - Request driver to start a scan | |
214 | * @wpa_s: Pointer to wpa_supplicant data | |
215 | * @params: Scan parameters | |
216 | * Returns: 0 on success, -1 on failure | |
217 | */ | |
60b94c98 JM |
218 | int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s, |
219 | struct wpa_driver_scan_params *params) | |
220 | { | |
221 | int ret; | |
222 | ||
223 | wpa_supplicant_notify_scanning(wpa_s, 1); | |
224 | ||
17fbb751 | 225 | ret = wpa_drv_scan(wpa_s, params); |
60b94c98 JM |
226 | if (ret) { |
227 | wpa_supplicant_notify_scanning(wpa_s, 0); | |
228 | wpas_notify_scan_done(wpa_s, 0); | |
0b7a25c0 | 229 | } else { |
60b94c98 | 230 | wpa_s->scan_runs++; |
0b7a25c0 JM |
231 | wpa_s->normal_scans++; |
232 | } | |
60b94c98 JM |
233 | |
234 | return ret; | |
235 | } | |
236 | ||
237 | ||
6a90053c LC |
238 | static void |
239 | wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx) | |
240 | { | |
241 | struct wpa_supplicant *wpa_s = eloop_ctx; | |
242 | ||
243 | wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan"); | |
244 | ||
245 | if (wpa_supplicant_req_sched_scan(wpa_s)) | |
246 | wpa_supplicant_req_scan(wpa_s, 0, 0); | |
247 | } | |
248 | ||
249 | ||
cbdf3507 LC |
250 | static void |
251 | wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx) | |
252 | { | |
253 | struct wpa_supplicant *wpa_s = eloop_ctx; | |
254 | ||
255 | wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it"); | |
256 | ||
257 | wpa_s->sched_scan_timed_out = 1; | |
258 | wpa_supplicant_cancel_sched_scan(wpa_s); | |
259 | } | |
260 | ||
261 | ||
262 | static int | |
263 | wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s, | |
264 | struct wpa_driver_scan_params *params, | |
265 | int interval) | |
266 | { | |
267 | int ret; | |
268 | ||
cbdf3507 LC |
269 | wpa_supplicant_notify_scanning(wpa_s, 1); |
270 | ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000); | |
271 | if (ret) | |
272 | wpa_supplicant_notify_scanning(wpa_s, 0); | |
273 | else | |
274 | wpa_s->sched_scanning = 1; | |
275 | ||
276 | return ret; | |
277 | } | |
278 | ||
279 | ||
280 | static int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s) | |
281 | { | |
282 | int ret; | |
283 | ||
284 | ret = wpa_drv_stop_sched_scan(wpa_s); | |
285 | if (ret) { | |
286 | wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!"); | |
287 | /* TODO: what to do if stopping fails? */ | |
288 | return -1; | |
289 | } | |
290 | ||
291 | return ret; | |
292 | } | |
293 | ||
294 | ||
3812464c JM |
295 | static struct wpa_driver_scan_filter * |
296 | wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids) | |
297 | { | |
298 | struct wpa_driver_scan_filter *ssids; | |
299 | struct wpa_ssid *ssid; | |
300 | size_t count; | |
301 | ||
302 | *num_ssids = 0; | |
303 | if (!conf->filter_ssids) | |
304 | return NULL; | |
305 | ||
306 | for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) { | |
307 | if (ssid->ssid && ssid->ssid_len) | |
308 | count++; | |
309 | } | |
310 | if (count == 0) | |
311 | return NULL; | |
312 | ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter)); | |
313 | if (ssids == NULL) | |
314 | return NULL; | |
315 | ||
316 | for (ssid = conf->ssid; ssid; ssid = ssid->next) { | |
317 | if (!ssid->ssid || !ssid->ssid_len) | |
318 | continue; | |
319 | os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len); | |
320 | ssids[*num_ssids].ssid_len = ssid->ssid_len; | |
321 | (*num_ssids)++; | |
322 | } | |
323 | ||
324 | return ssids; | |
325 | } | |
326 | ||
327 | ||
5f738a21 LC |
328 | static void wpa_supplicant_optimize_freqs( |
329 | struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params) | |
330 | { | |
331 | #ifdef CONFIG_P2P | |
332 | if (params->freqs == NULL && wpa_s->p2p_in_provisioning && | |
333 | wpa_s->go_params) { | |
334 | /* Optimize provisioning state scan based on GO information */ | |
335 | if (wpa_s->p2p_in_provisioning < 5 && | |
336 | wpa_s->go_params->freq > 0) { | |
337 | wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO " | |
338 | "preferred frequency %d MHz", | |
339 | wpa_s->go_params->freq); | |
340 | params->freqs = os_zalloc(2 * sizeof(int)); | |
341 | if (params->freqs) | |
342 | params->freqs[0] = wpa_s->go_params->freq; | |
343 | } else if (wpa_s->p2p_in_provisioning < 8 && | |
344 | wpa_s->go_params->freq_list[0]) { | |
345 | wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common " | |
346 | "channels"); | |
347 | int_array_concat(¶ms->freqs, | |
348 | wpa_s->go_params->freq_list); | |
349 | if (params->freqs) | |
350 | int_array_sort_unique(params->freqs); | |
351 | } | |
352 | wpa_s->p2p_in_provisioning++; | |
353 | } | |
354 | #endif /* CONFIG_P2P */ | |
355 | ||
356 | #ifdef CONFIG_WPS | |
357 | if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) { | |
358 | /* | |
359 | * Optimize post-provisioning scan based on channel used | |
360 | * during provisioning. | |
361 | */ | |
362 | wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz " | |
363 | "that was used during provisioning", wpa_s->wps_freq); | |
364 | params->freqs = os_zalloc(2 * sizeof(int)); | |
365 | if (params->freqs) | |
366 | params->freqs[0] = wpa_s->wps_freq; | |
367 | wpa_s->after_wps--; | |
368 | } | |
369 | ||
1e7fb4f1 JM |
370 | if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq) |
371 | { | |
372 | /* Optimize provisioning scan based on already known channel */ | |
373 | wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz", | |
374 | wpa_s->wps_freq); | |
375 | params->freqs = os_zalloc(2 * sizeof(int)); | |
376 | if (params->freqs) | |
377 | params->freqs[0] = wpa_s->wps_freq; | |
378 | wpa_s->known_wps_freq = 0; /* only do this once */ | |
379 | } | |
5f738a21 LC |
380 | #endif /* CONFIG_WPS */ |
381 | } | |
382 | ||
383 | ||
46ee0427 JM |
384 | #ifdef CONFIG_INTERWORKING |
385 | static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s, | |
386 | struct wpabuf *buf) | |
387 | { | |
388 | if (wpa_s->conf->interworking == 0) | |
389 | return; | |
390 | ||
391 | wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB); | |
392 | wpabuf_put_u8(buf, 4); | |
393 | wpabuf_put_u8(buf, 0x00); | |
394 | wpabuf_put_u8(buf, 0x00); | |
395 | wpabuf_put_u8(buf, 0x00); | |
396 | wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */ | |
397 | ||
398 | wpabuf_put_u8(buf, WLAN_EID_INTERWORKING); | |
399 | wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 : | |
400 | 1 + ETH_ALEN); | |
11540c0b | 401 | wpabuf_put_u8(buf, wpa_s->conf->access_network_type); |
46ee0427 JM |
402 | /* No Venue Info */ |
403 | if (!is_zero_ether_addr(wpa_s->conf->hessid)) | |
404 | wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN); | |
405 | } | |
406 | #endif /* CONFIG_INTERWORKING */ | |
407 | ||
408 | ||
a13e07ec | 409 | static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s) |
6fc6879b | 410 | { |
46ee0427 | 411 | struct wpabuf *extra_ie = NULL; |
b01c18a8 | 412 | #ifdef CONFIG_WPS |
509a3972 | 413 | int wps = 0; |
f90c86d4 | 414 | enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO; |
46ee0427 JM |
415 | #endif /* CONFIG_WPS */ |
416 | ||
417 | #ifdef CONFIG_INTERWORKING | |
418 | if (wpa_s->conf->interworking && | |
419 | wpabuf_resize(&extra_ie, 100) == 0) | |
420 | wpas_add_interworking_elements(wpa_s, extra_ie); | |
421 | #endif /* CONFIG_INTERWORKING */ | |
5f738a21 | 422 | |
46ee0427 | 423 | #ifdef CONFIG_WPS |
5f738a21 LC |
424 | wps = wpas_wps_in_use(wpa_s, &req_type); |
425 | ||
426 | if (wps) { | |
46ee0427 | 427 | struct wpabuf *wps_ie; |
360182ed JM |
428 | wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON : |
429 | DEV_PW_DEFAULT, | |
430 | &wpa_s->wps->dev, | |
5f738a21 LC |
431 | wpa_s->wps->uuid, req_type, |
432 | 0, NULL); | |
433 | if (wps_ie) { | |
46ee0427 JM |
434 | if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0) |
435 | wpabuf_put_buf(extra_ie, wps_ie); | |
436 | wpabuf_free(wps_ie); | |
5f738a21 LC |
437 | } |
438 | } | |
439 | ||
440 | #ifdef CONFIG_P2P | |
46ee0427 | 441 | if (wps) { |
5f738a21 | 442 | size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p); |
46ee0427 JM |
443 | if (wpabuf_resize(&extra_ie, ielen) == 0) |
444 | wpas_p2p_scan_ie(wpa_s, extra_ie); | |
5f738a21 LC |
445 | } |
446 | #endif /* CONFIG_P2P */ | |
447 | ||
b01c18a8 | 448 | #endif /* CONFIG_WPS */ |
5f738a21 | 449 | |
46ee0427 | 450 | return extra_ie; |
5f738a21 LC |
451 | } |
452 | ||
453 | ||
5cc70322 JM |
454 | #ifdef CONFIG_P2P |
455 | ||
456 | /* | |
457 | * Check whether there are any enabled networks or credentials that could be | |
458 | * used for a non-P2P connection. | |
459 | */ | |
460 | static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s) | |
461 | { | |
462 | struct wpa_ssid *ssid; | |
463 | ||
464 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { | |
465 | if (wpas_network_disabled(wpa_s, ssid)) | |
466 | continue; | |
467 | if (!ssid->p2p_group) | |
468 | return 1; | |
469 | } | |
470 | ||
471 | if (wpa_s->conf->cred && wpa_s->conf->interworking && | |
472 | wpa_s->conf->auto_interworking) | |
473 | return 1; | |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
478 | ||
479 | /* | |
480 | * Find the operating frequency of any other virtual interface that is using | |
481 | * the same radio concurrently. | |
482 | */ | |
483 | static int shared_vif_oper_freq(struct wpa_supplicant *wpa_s) | |
484 | { | |
485 | const char *rn, *rn2; | |
486 | struct wpa_supplicant *ifs; | |
487 | u8 bssid[ETH_ALEN]; | |
488 | ||
489 | if (!wpa_s->driver->get_radio_name) | |
490 | return -1; | |
491 | ||
492 | rn = wpa_s->driver->get_radio_name(wpa_s->drv_priv); | |
493 | if (rn == NULL || rn[0] == '\0') | |
494 | return -1; | |
495 | ||
496 | for (ifs = wpa_s->global->ifaces; ifs; ifs = ifs->next) { | |
497 | if (ifs == wpa_s || !ifs->driver->get_radio_name) | |
498 | continue; | |
499 | ||
500 | rn2 = ifs->driver->get_radio_name(ifs->drv_priv); | |
501 | if (!rn2 || os_strcmp(rn, rn2) != 0) | |
502 | continue; | |
503 | ||
504 | if (ifs->current_ssid == NULL || ifs->assoc_freq == 0) | |
505 | continue; | |
506 | ||
507 | if (ifs->current_ssid->mode == WPAS_MODE_AP || | |
508 | ifs->current_ssid->mode == WPAS_MODE_P2P_GO) | |
509 | return ifs->current_ssid->frequency; | |
510 | if (wpa_drv_get_bssid(ifs, bssid) == 0) | |
511 | return ifs->assoc_freq; | |
512 | } | |
513 | ||
514 | return 0; | |
515 | } | |
516 | ||
517 | #endif /* CONFIG_P2P */ | |
518 | ||
519 | ||
5f738a21 LC |
520 | static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx) |
521 | { | |
522 | struct wpa_supplicant *wpa_s = eloop_ctx; | |
523 | struct wpa_ssid *ssid; | |
4115303b JM |
524 | enum scan_req_type scan_req = NORMAL_SCAN_REQ; |
525 | int ret; | |
b9b12d02 | 526 | struct wpabuf *extra_ie = NULL; |
e76baaac | 527 | struct wpa_driver_scan_params params; |
7c865c68 | 528 | struct wpa_driver_scan_params *scan_params; |
e76baaac | 529 | size_t max_ssids; |
207ef3fb | 530 | enum wpa_states prev_state; |
6fc6879b | 531 | |
8401a6b0 | 532 | if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) { |
f049052b | 533 | wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled"); |
b1cd021e | 534 | wpas_p2p_continue_after_scan(wpa_s); |
8401a6b0 JM |
535 | return; |
536 | } | |
537 | ||
4115303b | 538 | if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) { |
ac06fb12 | 539 | wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan"); |
3180d7a2 | 540 | wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED); |
b1cd021e | 541 | wpas_p2p_continue_after_scan(wpa_s); |
6fc6879b | 542 | return; |
3180d7a2 | 543 | } |
6fc6879b | 544 | |
349493bd | 545 | if (!wpa_supplicant_enabled_networks(wpa_s) && |
4115303b | 546 | wpa_s->scan_req == NORMAL_SCAN_REQ) { |
f049052b | 547 | wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan"); |
6fc6879b | 548 | wpa_supplicant_set_state(wpa_s, WPA_INACTIVE); |
b1cd021e | 549 | wpas_p2p_continue_after_scan(wpa_s); |
6fc6879b JM |
550 | return; |
551 | } | |
6fc6879b | 552 | |
c2a04078 JM |
553 | if (wpa_s->conf->ap_scan != 0 && |
554 | (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) { | |
f049052b BG |
555 | wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - " |
556 | "overriding ap_scan configuration"); | |
6fc6879b | 557 | wpa_s->conf->ap_scan = 0; |
8bac466b | 558 | wpas_notify_ap_scan_changed(wpa_s); |
6fc6879b JM |
559 | } |
560 | ||
561 | if (wpa_s->conf->ap_scan == 0) { | |
562 | wpa_supplicant_gen_assoc_event(wpa_s); | |
563 | return; | |
564 | } | |
565 | ||
303f60d3 JM |
566 | #ifdef CONFIG_P2P |
567 | if (wpas_p2p_in_progress(wpa_s)) { | |
99fcd404 JM |
568 | if (wpa_s->sta_scan_pending && |
569 | wpas_p2p_in_progress(wpa_s) == 2 && | |
e665ca9a | 570 | wpa_s->global->p2p_cb_on_scan_complete) { |
99fcd404 JM |
571 | wpa_dbg(wpa_s, MSG_DEBUG, "Process pending station " |
572 | "mode scan during P2P search"); | |
573 | } else { | |
303f60d3 JM |
574 | wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan " |
575 | "while P2P operation is in progress"); | |
99fcd404 | 576 | wpa_s->sta_scan_pending = 1; |
303f60d3 | 577 | wpa_supplicant_req_scan(wpa_s, 5, 0); |
99fcd404 | 578 | return; |
303f60d3 | 579 | } |
303f60d3 JM |
580 | } |
581 | #endif /* CONFIG_P2P */ | |
582 | ||
17fbb751 | 583 | if (wpa_s->conf->ap_scan == 2) |
e76baaac JM |
584 | max_ssids = 1; |
585 | else { | |
586 | max_ssids = wpa_s->max_scan_ssids; | |
587 | if (max_ssids > WPAS_MAX_SCAN_SSIDS) | |
588 | max_ssids = WPAS_MAX_SCAN_SSIDS; | |
589 | } | |
590 | ||
e76baaac | 591 | scan_req = wpa_s->scan_req; |
4115303b | 592 | wpa_s->scan_req = NORMAL_SCAN_REQ; |
e76baaac JM |
593 | |
594 | os_memset(¶ms, 0, sizeof(params)); | |
595 | ||
207ef3fb | 596 | prev_state = wpa_s->wpa_state; |
6fc6879b JM |
597 | if (wpa_s->wpa_state == WPA_DISCONNECTED || |
598 | wpa_s->wpa_state == WPA_INACTIVE) | |
599 | wpa_supplicant_set_state(wpa_s, WPA_SCANNING); | |
600 | ||
7c865c68 TB |
601 | /* |
602 | * If autoscan has set its own scanning parameters | |
603 | */ | |
604 | if (wpa_s->autoscan_params != NULL) { | |
605 | scan_params = wpa_s->autoscan_params; | |
606 | goto scan; | |
607 | } | |
608 | ||
4115303b | 609 | if (scan_req != MANUAL_SCAN_REQ && wpa_s->connect_without_scan) { |
7dcdcfd6 JM |
610 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { |
611 | if (ssid == wpa_s->connect_without_scan) | |
612 | break; | |
613 | } | |
614 | wpa_s->connect_without_scan = NULL; | |
615 | if (ssid) { | |
616 | wpa_printf(MSG_DEBUG, "Start a pre-selected network " | |
617 | "without scan step"); | |
618 | wpa_supplicant_associate(wpa_s, NULL, ssid); | |
619 | return; | |
620 | } | |
621 | } | |
622 | ||
a21c05db | 623 | #ifdef CONFIG_P2P |
85ea132a JM |
624 | if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) && |
625 | wpa_s->go_params) { | |
a21c05db | 626 | wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during " |
85ea132a | 627 | "P2P group formation"); |
a21c05db JM |
628 | params.ssids[0].ssid = wpa_s->go_params->ssid; |
629 | params.ssids[0].ssid_len = wpa_s->go_params->ssid_len; | |
630 | params.num_ssids = 1; | |
631 | goto ssid_list_set; | |
632 | } | |
633 | #endif /* CONFIG_P2P */ | |
634 | ||
e76baaac | 635 | /* Find the starting point from which to continue scanning */ |
6fc6879b | 636 | ssid = wpa_s->conf->ssid; |
ba2a573c | 637 | if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) { |
6fc6879b JM |
638 | while (ssid) { |
639 | if (ssid == wpa_s->prev_scan_ssid) { | |
640 | ssid = ssid->next; | |
641 | break; | |
642 | } | |
643 | ssid = ssid->next; | |
644 | } | |
645 | } | |
6fc6879b | 646 | |
4115303b | 647 | if (scan_req != MANUAL_SCAN_REQ && wpa_s->conf->ap_scan == 2) { |
7dcdcfd6 | 648 | wpa_s->connect_without_scan = NULL; |
b3aa456b | 649 | wpa_s->prev_scan_wildcard = 0; |
e76baaac JM |
650 | wpa_supplicant_assoc_try(wpa_s, ssid); |
651 | return; | |
652 | } else if (wpa_s->conf->ap_scan == 2) { | |
6fc6879b | 653 | /* |
ba2a573c JM |
654 | * User-initiated scan request in ap_scan == 2; scan with |
655 | * wildcard SSID. | |
6fc6879b | 656 | */ |
e76baaac JM |
657 | ssid = NULL; |
658 | } else { | |
5be45e2e | 659 | struct wpa_ssid *start = ssid, *tssid; |
d3a98225 | 660 | int freqs_set = 0; |
e76baaac JM |
661 | if (ssid == NULL && max_ssids > 1) |
662 | ssid = wpa_s->conf->ssid; | |
663 | while (ssid) { | |
349493bd JM |
664 | if (!wpas_network_disabled(wpa_s, ssid) && |
665 | ssid->scan_ssid) { | |
e76baaac JM |
666 | wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID", |
667 | ssid->ssid, ssid->ssid_len); | |
668 | params.ssids[params.num_ssids].ssid = | |
669 | ssid->ssid; | |
670 | params.ssids[params.num_ssids].ssid_len = | |
671 | ssid->ssid_len; | |
672 | params.num_ssids++; | |
673 | if (params.num_ssids + 1 >= max_ssids) | |
674 | break; | |
675 | } | |
676 | ssid = ssid->next; | |
677 | if (ssid == start) | |
678 | break; | |
679 | if (ssid == NULL && max_ssids > 1 && | |
680 | start != wpa_s->conf->ssid) | |
681 | ssid = wpa_s->conf->ssid; | |
6fc6879b | 682 | } |
d3a98225 | 683 | |
5be45e2e | 684 | for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) { |
349493bd | 685 | if (wpas_network_disabled(wpa_s, tssid)) |
d3a98225 | 686 | continue; |
5be45e2e | 687 | if ((params.freqs || !freqs_set) && tssid->scan_freq) { |
d3a98225 | 688 | int_array_concat(¶ms.freqs, |
5be45e2e | 689 | tssid->scan_freq); |
d3a98225 JM |
690 | } else { |
691 | os_free(params.freqs); | |
692 | params.freqs = NULL; | |
693 | } | |
694 | freqs_set = 1; | |
695 | } | |
696 | int_array_sort_unique(params.freqs); | |
6fc6879b JM |
697 | } |
698 | ||
b3aa456b ES |
699 | if (ssid && max_ssids == 1) { |
700 | /* | |
701 | * If the driver is limited to 1 SSID at a time interleave | |
702 | * wildcard SSID scans with specific SSID scans to avoid | |
703 | * waiting a long time for a wildcard scan. | |
704 | */ | |
705 | if (!wpa_s->prev_scan_wildcard) { | |
706 | params.ssids[0].ssid = NULL; | |
707 | params.ssids[0].ssid_len = 0; | |
708 | wpa_s->prev_scan_wildcard = 1; | |
709 | wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for " | |
710 | "wildcard SSID (Interleave with specific)"); | |
711 | } else { | |
712 | wpa_s->prev_scan_ssid = ssid; | |
713 | wpa_s->prev_scan_wildcard = 0; | |
714 | wpa_dbg(wpa_s, MSG_DEBUG, | |
715 | "Starting AP scan for specific SSID: %s", | |
716 | wpa_ssid_txt(ssid->ssid, ssid->ssid_len)); | |
e76baaac | 717 | } |
b3aa456b ES |
718 | } else if (ssid) { |
719 | /* max_ssids > 1 */ | |
720 | ||
721 | wpa_s->prev_scan_ssid = ssid; | |
722 | wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in " | |
723 | "the scan request"); | |
724 | params.num_ssids++; | |
e76baaac | 725 | } else { |
ba2a573c | 726 | wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN; |
e76baaac | 727 | params.num_ssids++; |
f049052b BG |
728 | wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard " |
729 | "SSID"); | |
6fc6879b | 730 | } |
a21c05db JM |
731 | #ifdef CONFIG_P2P |
732 | ssid_list_set: | |
733 | #endif /* CONFIG_P2P */ | |
6fc6879b | 734 | |
5f738a21 | 735 | wpa_supplicant_optimize_freqs(wpa_s, ¶ms); |
a13e07ec | 736 | extra_ie = wpa_supplicant_extra_ies(wpa_s); |
0e65037c | 737 | |
c923b8a5 | 738 | #ifdef CONFIG_HS20 |
5ebe8c81 | 739 | if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0) |
c923b8a5 JK |
740 | wpas_hs20_add_indication(extra_ie); |
741 | #endif /* CONFIG_HS20 */ | |
742 | ||
f47d639d | 743 | if (params.freqs == NULL && wpa_s->next_scan_freqs) { |
f049052b BG |
744 | wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously " |
745 | "generated frequency list"); | |
f47d639d JM |
746 | params.freqs = wpa_s->next_scan_freqs; |
747 | } else | |
748 | os_free(wpa_s->next_scan_freqs); | |
749 | wpa_s->next_scan_freqs = NULL; | |
750 | ||
3812464c JM |
751 | params.filter_ssids = wpa_supplicant_build_filter_ssids( |
752 | wpa_s->conf, ¶ms.num_filter_ssids); | |
46ee0427 JM |
753 | if (extra_ie) { |
754 | params.extra_ies = wpabuf_head(extra_ie); | |
755 | params.extra_ies_len = wpabuf_len(extra_ie); | |
756 | } | |
3812464c | 757 | |
d1dd48e3 | 758 | #ifdef CONFIG_P2P |
85ea132a JM |
759 | if (wpa_s->p2p_in_provisioning || |
760 | (wpa_s->show_group_started && wpa_s->go_params)) { | |
d1dd48e3 JM |
761 | /* |
762 | * The interface may not yet be in P2P mode, so we have to | |
763 | * explicitly request P2P probe to disable CCK rates. | |
764 | */ | |
765 | params.p2p_probe = 1; | |
766 | } | |
767 | #endif /* CONFIG_P2P */ | |
768 | ||
7c865c68 TB |
769 | scan_params = ¶ms; |
770 | ||
771 | scan: | |
5cc70322 JM |
772 | #ifdef CONFIG_P2P |
773 | /* | |
774 | * If the driver does not support multi-channel concurrency and a | |
775 | * virtual interface that shares the same radio with the wpa_s interface | |
776 | * is operating there may not be need to scan other channels apart from | |
777 | * the current operating channel on the other virtual interface. Filter | |
778 | * out other channels in case we are trying to find a connection for a | |
779 | * station interface when we are not configured to prefer station | |
780 | * connection and a concurrent operation is already in process. | |
781 | */ | |
4115303b | 782 | if (wpa_s->scan_for_connection && scan_req == NORMAL_SCAN_REQ && |
5cc70322 JM |
783 | !scan_params->freqs && !params.freqs && |
784 | wpas_is_p2p_prioritized(wpa_s) && | |
785 | !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_MULTI_CHANNEL_CONCURRENT) && | |
786 | wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE && | |
787 | non_p2p_network_enabled(wpa_s)) { | |
788 | int freq = shared_vif_oper_freq(wpa_s); | |
789 | if (freq > 0) { | |
790 | wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only the current " | |
791 | "operating channel (%d MHz) since driver does " | |
792 | "not support multi-channel concurrency", freq); | |
793 | params.freqs = os_zalloc(sizeof(int) * 2); | |
794 | if (params.freqs) | |
795 | params.freqs[0] = freq; | |
796 | scan_params->freqs = params.freqs; | |
797 | } | |
798 | } | |
799 | #endif /* CONFIG_P2P */ | |
800 | ||
7c865c68 | 801 | ret = wpa_supplicant_trigger_scan(wpa_s, scan_params); |
6fc6879b | 802 | |
46ee0427 | 803 | wpabuf_free(extra_ie); |
d3a98225 | 804 | os_free(params.freqs); |
3812464c | 805 | os_free(params.filter_ssids); |
ad08c363 | 806 | |
6fc6879b | 807 | if (ret) { |
f049052b | 808 | wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan"); |
207ef3fb JM |
809 | if (prev_state != wpa_s->wpa_state) |
810 | wpa_supplicant_set_state(wpa_s, prev_state); | |
23270cd8 JM |
811 | /* Restore scan_req since we will try to scan again */ |
812 | wpa_s->scan_req = scan_req; | |
1c4c9c50 | 813 | wpa_supplicant_req_scan(wpa_s, 1, 0); |
5cc70322 JM |
814 | } else { |
815 | wpa_s->scan_for_connection = 0; | |
d902a9c1 | 816 | } |
6fc6879b JM |
817 | } |
818 | ||
819 | ||
9e737f08 PF |
820 | void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec) |
821 | { | |
822 | struct os_time remaining, new_int; | |
823 | int cancelled; | |
824 | ||
825 | cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL, | |
826 | &remaining); | |
827 | ||
828 | new_int.sec = sec; | |
829 | new_int.usec = 0; | |
830 | if (cancelled && os_time_before(&remaining, &new_int)) { | |
831 | new_int.sec = remaining.sec; | |
832 | new_int.usec = remaining.usec; | |
833 | } | |
834 | ||
835 | eloop_register_timeout(new_int.sec, new_int.usec, wpa_supplicant_scan, | |
836 | wpa_s, NULL); | |
837 | wpa_s->scan_interval = sec; | |
838 | } | |
839 | ||
840 | ||
6fc6879b JM |
841 | /** |
842 | * wpa_supplicant_req_scan - Schedule a scan for neighboring access points | |
843 | * @wpa_s: Pointer to wpa_supplicant data | |
844 | * @sec: Number of seconds after which to scan | |
845 | * @usec: Number of microseconds after which to scan | |
846 | * | |
847 | * This function is used to schedule a scan for neighboring access points after | |
848 | * the specified time. | |
849 | */ | |
850 | void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec) | |
851 | { | |
7e148849 DW |
852 | /* If there's at least one network that should be specifically scanned |
853 | * then don't cancel the scan and reschedule. Some drivers do | |
854 | * background scanning which generates frequent scan results, and that | |
855 | * causes the specific SSID scan to get continually pushed back and | |
856 | * never happen, which causes hidden APs to never get probe-scanned. | |
857 | */ | |
858 | if (eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL) && | |
859 | wpa_s->conf->ap_scan == 1) { | |
860 | struct wpa_ssid *ssid = wpa_s->conf->ssid; | |
861 | ||
862 | while (ssid) { | |
349493bd JM |
863 | if (!wpas_network_disabled(wpa_s, ssid) && |
864 | ssid->scan_ssid) | |
7e148849 DW |
865 | break; |
866 | ssid = ssid->next; | |
867 | } | |
868 | if (ssid) { | |
f049052b | 869 | wpa_dbg(wpa_s, MSG_DEBUG, "Not rescheduling scan to " |
7e148849 DW |
870 | "ensure that specific SSID scans occur"); |
871 | return; | |
872 | } | |
873 | } | |
874 | ||
f049052b | 875 | wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec", |
6fc6879b JM |
876 | sec, usec); |
877 | eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL); | |
878 | eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL); | |
879 | } | |
880 | ||
881 | ||
6a90053c LC |
882 | /** |
883 | * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan | |
884 | * @wpa_s: Pointer to wpa_supplicant data | |
885 | * @sec: Number of seconds after which to scan | |
886 | * @usec: Number of microseconds after which to scan | |
2c09af30 | 887 | * Returns: 0 on success or -1 otherwise |
6a90053c LC |
888 | * |
889 | * This function is used to schedule periodic scans for neighboring | |
890 | * access points after the specified time. | |
891 | */ | |
892 | int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s, | |
893 | int sec, int usec) | |
894 | { | |
895 | if (!wpa_s->sched_scan_supported) | |
896 | return -1; | |
897 | ||
898 | eloop_register_timeout(sec, usec, | |
899 | wpa_supplicant_delayed_sched_scan_timeout, | |
900 | wpa_s, NULL); | |
901 | ||
902 | return 0; | |
903 | } | |
904 | ||
905 | ||
cbdf3507 LC |
906 | /** |
907 | * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan | |
908 | * @wpa_s: Pointer to wpa_supplicant data | |
2c09af30 | 909 | * Returns: 0 is sched_scan was started or -1 otherwise |
cbdf3507 LC |
910 | * |
911 | * This function is used to schedule periodic scans for neighboring | |
912 | * access points repeating the scan continuously. | |
913 | */ | |
914 | int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s) | |
915 | { | |
916 | struct wpa_driver_scan_params params; | |
7c865c68 | 917 | struct wpa_driver_scan_params *scan_params; |
cbdf3507 | 918 | enum wpa_states prev_state; |
7c865c68 | 919 | struct wpa_ssid *ssid = NULL; |
a13e07ec | 920 | struct wpabuf *extra_ie = NULL; |
cbdf3507 | 921 | int ret; |
cbdf3507 | 922 | unsigned int max_sched_scan_ssids; |
76a5249e | 923 | int wildcard = 0; |
0b7a25c0 | 924 | int need_ssids; |
cbdf3507 LC |
925 | |
926 | if (!wpa_s->sched_scan_supported) | |
927 | return -1; | |
928 | ||
929 | if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS) | |
930 | max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS; | |
931 | else | |
932 | max_sched_scan_ssids = wpa_s->max_sched_scan_ssids; | |
54ddd743 | 933 | if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload) |
76a5249e | 934 | return -1; |
cbdf3507 | 935 | |
1966e3d1 ES |
936 | if (wpa_s->sched_scanning) { |
937 | wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning"); | |
cbdf3507 | 938 | return 0; |
1966e3d1 | 939 | } |
cbdf3507 | 940 | |
0b7a25c0 JM |
941 | need_ssids = 0; |
942 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { | |
349493bd | 943 | if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) { |
0b7a25c0 JM |
944 | /* Use wildcard SSID to find this network */ |
945 | wildcard = 1; | |
349493bd JM |
946 | } else if (!wpas_network_disabled(wpa_s, ssid) && |
947 | ssid->ssid_len) | |
0b7a25c0 | 948 | need_ssids++; |
aa283ddd JM |
949 | |
950 | #ifdef CONFIG_WPS | |
349493bd | 951 | if (!wpas_network_disabled(wpa_s, ssid) && |
fea7c3a0 | 952 | ssid->key_mgmt == WPA_KEY_MGMT_WPS) { |
aa283ddd JM |
953 | /* |
954 | * Normal scan is more reliable and faster for WPS | |
955 | * operations and since these are for short periods of | |
956 | * time, the benefit of trying to use sched_scan would | |
957 | * be limited. | |
958 | */ | |
959 | wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of " | |
960 | "sched_scan for WPS"); | |
961 | return -1; | |
962 | } | |
963 | #endif /* CONFIG_WPS */ | |
0b7a25c0 JM |
964 | } |
965 | if (wildcard) | |
966 | need_ssids++; | |
967 | ||
968 | if (wpa_s->normal_scans < 3 && | |
969 | (need_ssids <= wpa_s->max_scan_ssids || | |
970 | wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) { | |
971 | /* | |
972 | * When normal scan can speed up operations, use that for the | |
973 | * first operations before starting the sched_scan to allow | |
974 | * user space sleep more. We do this only if the normal scan | |
975 | * has functionality that is suitable for this or if the | |
976 | * sched_scan does not have better support for multiple SSIDs. | |
977 | */ | |
978 | wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of " | |
979 | "sched_scan for initial scans (normal_scans=%d)", | |
980 | wpa_s->normal_scans); | |
981 | return -1; | |
982 | } | |
983 | ||
cbdf3507 LC |
984 | os_memset(¶ms, 0, sizeof(params)); |
985 | ||
b59e6f26 LC |
986 | /* If we can't allocate space for the filters, we just don't filter */ |
987 | params.filter_ssids = os_zalloc(wpa_s->max_match_sets * | |
988 | sizeof(struct wpa_driver_scan_filter)); | |
989 | ||
cbdf3507 LC |
990 | prev_state = wpa_s->wpa_state; |
991 | if (wpa_s->wpa_state == WPA_DISCONNECTED || | |
992 | wpa_s->wpa_state == WPA_INACTIVE) | |
993 | wpa_supplicant_set_state(wpa_s, WPA_SCANNING); | |
994 | ||
7c865c68 TB |
995 | if (wpa_s->autoscan_params != NULL) { |
996 | scan_params = wpa_s->autoscan_params; | |
997 | goto scan; | |
998 | } | |
999 | ||
cbdf3507 LC |
1000 | /* Find the starting point from which to continue scanning */ |
1001 | ssid = wpa_s->conf->ssid; | |
1002 | if (wpa_s->prev_sched_ssid) { | |
1003 | while (ssid) { | |
1004 | if (ssid == wpa_s->prev_sched_ssid) { | |
1005 | ssid = ssid->next; | |
1006 | break; | |
1007 | } | |
1008 | ssid = ssid->next; | |
1009 | } | |
1010 | } | |
1011 | ||
1012 | if (!ssid || !wpa_s->prev_sched_ssid) { | |
1013 | wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list"); | |
1014 | ||
7c865c68 TB |
1015 | if (wpa_s->sched_scan_interval == 0) |
1016 | wpa_s->sched_scan_interval = 10; | |
cbdf3507 LC |
1017 | wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2; |
1018 | wpa_s->first_sched_scan = 1; | |
1019 | ssid = wpa_s->conf->ssid; | |
1020 | wpa_s->prev_sched_ssid = ssid; | |
1021 | } | |
1022 | ||
76a5249e JM |
1023 | if (wildcard) { |
1024 | wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan"); | |
1025 | params.num_ssids++; | |
1026 | } | |
1027 | ||
cbdf3507 | 1028 | while (ssid) { |
349493bd | 1029 | if (wpas_network_disabled(wpa_s, ssid)) |
5edddf41 | 1030 | goto next; |
cbdf3507 | 1031 | |
fcd16847 JM |
1032 | if (params.num_filter_ssids < wpa_s->max_match_sets && |
1033 | params.filter_ssids && ssid->ssid && ssid->ssid_len) { | |
1966e3d1 ES |
1034 | wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s", |
1035 | wpa_ssid_txt(ssid->ssid, ssid->ssid_len)); | |
b59e6f26 LC |
1036 | os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid, |
1037 | ssid->ssid, ssid->ssid_len); | |
1038 | params.filter_ssids[params.num_filter_ssids].ssid_len = | |
1039 | ssid->ssid_len; | |
1040 | params.num_filter_ssids++; | |
86b47aaf JM |
1041 | } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len) |
1042 | { | |
1043 | wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID " | |
1044 | "filter for sched_scan - drop filter"); | |
1045 | os_free(params.filter_ssids); | |
1046 | params.filter_ssids = NULL; | |
1047 | params.num_filter_ssids = 0; | |
b59e6f26 LC |
1048 | } |
1049 | ||
3f56f3a4 | 1050 | if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) { |
76a5249e JM |
1051 | if (params.num_ssids == max_sched_scan_ssids) |
1052 | break; /* only room for broadcast SSID */ | |
3f56f3a4 JM |
1053 | wpa_dbg(wpa_s, MSG_DEBUG, |
1054 | "add to active scan ssid: %s", | |
1966e3d1 | 1055 | wpa_ssid_txt(ssid->ssid, ssid->ssid_len)); |
cbdf3507 LC |
1056 | params.ssids[params.num_ssids].ssid = |
1057 | ssid->ssid; | |
1058 | params.ssids[params.num_ssids].ssid_len = | |
1059 | ssid->ssid_len; | |
1060 | params.num_ssids++; | |
b59e6f26 | 1061 | if (params.num_ssids >= max_sched_scan_ssids) { |
cbdf3507 | 1062 | wpa_s->prev_sched_ssid = ssid; |
b55aca46 JM |
1063 | do { |
1064 | ssid = ssid->next; | |
1065 | } while (ssid && | |
349493bd | 1066 | (wpas_network_disabled(wpa_s, ssid) || |
fea7c3a0 | 1067 | !ssid->scan_ssid)); |
cbdf3507 LC |
1068 | break; |
1069 | } | |
1070 | } | |
b59e6f26 | 1071 | |
5edddf41 | 1072 | next: |
cbdf3507 LC |
1073 | wpa_s->prev_sched_ssid = ssid; |
1074 | ssid = ssid->next; | |
1075 | } | |
1076 | ||
7c6a266c JM |
1077 | if (params.num_filter_ssids == 0) { |
1078 | os_free(params.filter_ssids); | |
1079 | params.filter_ssids = NULL; | |
1080 | } | |
1081 | ||
a13e07ec ES |
1082 | extra_ie = wpa_supplicant_extra_ies(wpa_s); |
1083 | if (extra_ie) { | |
1084 | params.extra_ies = wpabuf_head(extra_ie); | |
1085 | params.extra_ies_len = wpabuf_len(extra_ie); | |
1086 | } | |
cbdf3507 | 1087 | |
7c865c68 TB |
1088 | scan_params = ¶ms; |
1089 | ||
1090 | scan: | |
a8cb5a88 | 1091 | if (ssid || !wpa_s->first_sched_scan) { |
a8cb5a88 JM |
1092 | wpa_dbg(wpa_s, MSG_DEBUG, |
1093 | "Starting sched scan: interval %d timeout %d", | |
1094 | wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout); | |
7d21a223 JM |
1095 | } else { |
1096 | wpa_dbg(wpa_s, MSG_DEBUG, | |
1097 | "Starting sched scan: interval %d (no timeout)", | |
1098 | wpa_s->sched_scan_interval); | |
a8cb5a88 | 1099 | } |
cbdf3507 | 1100 | |
7c865c68 | 1101 | ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params, |
cbdf3507 | 1102 | wpa_s->sched_scan_interval); |
a13e07ec | 1103 | wpabuf_free(extra_ie); |
b59e6f26 | 1104 | os_free(params.filter_ssids); |
cbdf3507 LC |
1105 | if (ret) { |
1106 | wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan"); | |
1107 | if (prev_state != wpa_s->wpa_state) | |
1108 | wpa_supplicant_set_state(wpa_s, prev_state); | |
1109 | return ret; | |
1110 | } | |
1111 | ||
1112 | /* If we have more SSIDs to scan, add a timeout so we scan them too */ | |
1113 | if (ssid || !wpa_s->first_sched_scan) { | |
1114 | wpa_s->sched_scan_timed_out = 0; | |
1115 | eloop_register_timeout(wpa_s->sched_scan_timeout, 0, | |
1116 | wpa_supplicant_sched_scan_timeout, | |
1117 | wpa_s, NULL); | |
1118 | wpa_s->first_sched_scan = 0; | |
1119 | wpa_s->sched_scan_timeout /= 2; | |
1120 | wpa_s->sched_scan_interval *= 2; | |
a09fc1cc DS |
1121 | if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) { |
1122 | wpa_s->sched_scan_interval = 10; | |
1123 | wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2; | |
1124 | } | |
cbdf3507 LC |
1125 | } |
1126 | ||
7ed52f67 DS |
1127 | /* If there is no more ssids, start next time from the beginning */ |
1128 | if (!ssid) | |
1129 | wpa_s->prev_sched_ssid = NULL; | |
1130 | ||
cbdf3507 LC |
1131 | return 0; |
1132 | } | |
1133 | ||
1134 | ||
6fc6879b JM |
1135 | /** |
1136 | * wpa_supplicant_cancel_scan - Cancel a scheduled scan request | |
1137 | * @wpa_s: Pointer to wpa_supplicant data | |
1138 | * | |
1139 | * This function is used to cancel a scan request scheduled with | |
1140 | * wpa_supplicant_req_scan(). | |
1141 | */ | |
1142 | void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s) | |
1143 | { | |
f049052b | 1144 | wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request"); |
6fc6879b | 1145 | eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL); |
b1cd021e | 1146 | wpas_p2p_continue_after_scan(wpa_s); |
6fc6879b | 1147 | } |
cb8564b1 DW |
1148 | |
1149 | ||
cbdf3507 LC |
1150 | /** |
1151 | * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans | |
1152 | * @wpa_s: Pointer to wpa_supplicant data | |
1153 | * | |
1154 | * This function is used to stop a periodic scheduled scan. | |
1155 | */ | |
1156 | void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s) | |
1157 | { | |
1158 | if (!wpa_s->sched_scanning) | |
1159 | return; | |
1160 | ||
1161 | wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan"); | |
1162 | eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL); | |
1163 | wpa_supplicant_stop_sched_scan(wpa_s); | |
1164 | } | |
1165 | ||
1166 | ||
2c09af30 JM |
1167 | /** |
1168 | * wpa_supplicant_notify_scanning - Indicate possible scan state change | |
1169 | * @wpa_s: Pointer to wpa_supplicant data | |
1170 | * @scanning: Whether scanning is currently in progress | |
1171 | * | |
1172 | * This function is to generate scanning notifycations. It is called whenever | |
1173 | * there may have been a change in scanning (scan started, completed, stopped). | |
1174 | * wpas_notify_scanning() is called whenever the scanning state changed from the | |
1175 | * previously notified state. | |
1176 | */ | |
cb8564b1 DW |
1177 | void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s, |
1178 | int scanning) | |
1179 | { | |
1180 | if (wpa_s->scanning != scanning) { | |
1181 | wpa_s->scanning = scanning; | |
8bac466b | 1182 | wpas_notify_scanning(wpa_s); |
cb8564b1 DW |
1183 | } |
1184 | } | |
1185 | ||
9ba9fa07 JM |
1186 | |
1187 | static int wpa_scan_get_max_rate(const struct wpa_scan_res *res) | |
1188 | { | |
1189 | int rate = 0; | |
1190 | const u8 *ie; | |
1191 | int i; | |
1192 | ||
1193 | ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES); | |
1194 | for (i = 0; ie && i < ie[1]; i++) { | |
1195 | if ((ie[i + 2] & 0x7f) > rate) | |
1196 | rate = ie[i + 2] & 0x7f; | |
1197 | } | |
1198 | ||
1199 | ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES); | |
1200 | for (i = 0; ie && i < ie[1]; i++) { | |
1201 | if ((ie[i + 2] & 0x7f) > rate) | |
1202 | rate = ie[i + 2] & 0x7f; | |
1203 | } | |
1204 | ||
1205 | return rate; | |
1206 | } | |
1207 | ||
1208 | ||
2c09af30 JM |
1209 | /** |
1210 | * wpa_scan_get_ie - Fetch a specified information element from a scan result | |
1211 | * @res: Scan result entry | |
1212 | * @ie: Information element identitifier (WLAN_EID_*) | |
1213 | * Returns: Pointer to the information element (id field) or %NULL if not found | |
1214 | * | |
1215 | * This function returns the first matching information element in the scan | |
1216 | * result. | |
1217 | */ | |
d1f9c410 JM |
1218 | const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie) |
1219 | { | |
1220 | const u8 *end, *pos; | |
1221 | ||
1222 | pos = (const u8 *) (res + 1); | |
1223 | end = pos + res->ie_len; | |
1224 | ||
1225 | while (pos + 1 < end) { | |
1226 | if (pos + 2 + pos[1] > end) | |
1227 | break; | |
1228 | if (pos[0] == ie) | |
1229 | return pos; | |
1230 | pos += 2 + pos[1]; | |
1231 | } | |
1232 | ||
1233 | return NULL; | |
1234 | } | |
1235 | ||
1236 | ||
2c09af30 JM |
1237 | /** |
1238 | * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result | |
1239 | * @res: Scan result entry | |
1240 | * @vendor_type: Vendor type (four octets starting the IE payload) | |
1241 | * Returns: Pointer to the information element (id field) or %NULL if not found | |
1242 | * | |
1243 | * This function returns the first matching information element in the scan | |
1244 | * result. | |
1245 | */ | |
9ba9fa07 JM |
1246 | const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res, |
1247 | u32 vendor_type) | |
1248 | { | |
1249 | const u8 *end, *pos; | |
1250 | ||
1251 | pos = (const u8 *) (res + 1); | |
1252 | end = pos + res->ie_len; | |
1253 | ||
1254 | while (pos + 1 < end) { | |
1255 | if (pos + 2 + pos[1] > end) | |
1256 | break; | |
1257 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
1258 | vendor_type == WPA_GET_BE32(&pos[2])) | |
1259 | return pos; | |
1260 | pos += 2 + pos[1]; | |
1261 | } | |
1262 | ||
1263 | return NULL; | |
1264 | } | |
1265 | ||
1266 | ||
2c09af30 JM |
1267 | /** |
1268 | * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result | |
1269 | * @res: Scan result entry | |
1270 | * @vendor_type: Vendor type (four octets starting the IE payload) | |
1271 | * Returns: Pointer to the information element payload or %NULL if not found | |
1272 | * | |
1273 | * This function returns concatenated payload of possibly fragmented vendor | |
1274 | * specific information elements in the scan result. The caller is responsible | |
1275 | * for freeing the returned buffer. | |
1276 | */ | |
9ba9fa07 JM |
1277 | struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res, |
1278 | u32 vendor_type) | |
1279 | { | |
1280 | struct wpabuf *buf; | |
1281 | const u8 *end, *pos; | |
1282 | ||
1283 | buf = wpabuf_alloc(res->ie_len); | |
1284 | if (buf == NULL) | |
1285 | return NULL; | |
1286 | ||
1287 | pos = (const u8 *) (res + 1); | |
1288 | end = pos + res->ie_len; | |
1289 | ||
54f489be JM |
1290 | while (pos + 1 < end) { |
1291 | if (pos + 2 + pos[1] > end) | |
1292 | break; | |
1293 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
1294 | vendor_type == WPA_GET_BE32(&pos[2])) | |
1295 | wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4); | |
1296 | pos += 2 + pos[1]; | |
1297 | } | |
1298 | ||
1299 | if (wpabuf_len(buf) == 0) { | |
1300 | wpabuf_free(buf); | |
1301 | buf = NULL; | |
1302 | } | |
1303 | ||
1304 | return buf; | |
1305 | } | |
1306 | ||
1307 | ||
577db0ae GM |
1308 | /* |
1309 | * Channels with a great SNR can operate at full rate. What is a great SNR? | |
1310 | * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general | |
1311 | * rule of thumb is that any SNR above 20 is good." This one | |
1312 | * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23 | |
1313 | * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a | |
1314 | * conservative value. | |
1315 | */ | |
1316 | #define GREAT_SNR 30 | |
1317 | ||
9ba9fa07 JM |
1318 | /* Compare function for sorting scan results. Return >0 if @b is considered |
1319 | * better. */ | |
1320 | static int wpa_scan_result_compar(const void *a, const void *b) | |
1321 | { | |
577db0ae GM |
1322 | #define IS_5GHZ(n) (n > 4000) |
1323 | #define MIN(a,b) a < b ? a : b | |
9ba9fa07 JM |
1324 | struct wpa_scan_res **_wa = (void *) a; |
1325 | struct wpa_scan_res **_wb = (void *) b; | |
1326 | struct wpa_scan_res *wa = *_wa; | |
1327 | struct wpa_scan_res *wb = *_wb; | |
1328 | int wpa_a, wpa_b, maxrate_a, maxrate_b; | |
577db0ae | 1329 | int snr_a, snr_b; |
9ba9fa07 JM |
1330 | |
1331 | /* WPA/WPA2 support preferred */ | |
1332 | wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL || | |
1333 | wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL; | |
1334 | wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL || | |
1335 | wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL; | |
1336 | ||
1337 | if (wpa_b && !wpa_a) | |
1338 | return 1; | |
1339 | if (!wpa_b && wpa_a) | |
1340 | return -1; | |
1341 | ||
1342 | /* privacy support preferred */ | |
1343 | if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 && | |
1344 | (wb->caps & IEEE80211_CAP_PRIVACY)) | |
1345 | return 1; | |
1346 | if ((wa->caps & IEEE80211_CAP_PRIVACY) && | |
1347 | (wb->caps & IEEE80211_CAP_PRIVACY) == 0) | |
1348 | return -1; | |
1349 | ||
577db0ae GM |
1350 | if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) && |
1351 | !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) { | |
1352 | snr_a = MIN(wa->level - wa->noise, GREAT_SNR); | |
1353 | snr_b = MIN(wb->level - wb->noise, GREAT_SNR); | |
1354 | } else { | |
1355 | /* Not suitable information to calculate SNR, so use level */ | |
1356 | snr_a = wa->level; | |
1357 | snr_b = wb->level; | |
1358 | } | |
1359 | ||
577db0ae GM |
1360 | /* best/max rate preferred if SNR close enough */ |
1361 | if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) || | |
9ba9fa07 JM |
1362 | (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) { |
1363 | maxrate_a = wpa_scan_get_max_rate(wa); | |
1364 | maxrate_b = wpa_scan_get_max_rate(wb); | |
1365 | if (maxrate_a != maxrate_b) | |
1366 | return maxrate_b - maxrate_a; | |
577db0ae GM |
1367 | if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq)) |
1368 | return IS_5GHZ(wa->freq) ? -1 : 1; | |
9ba9fa07 JM |
1369 | } |
1370 | ||
1371 | /* use freq for channel preference */ | |
1372 | ||
577db0ae | 1373 | /* all things being equal, use SNR; if SNRs are |
9ba9fa07 JM |
1374 | * identical, use quality values since some drivers may only report |
1375 | * that value and leave the signal level zero */ | |
577db0ae | 1376 | if (snr_b == snr_a) |
9ba9fa07 | 1377 | return wb->qual - wa->qual; |
577db0ae GM |
1378 | return snr_b - snr_a; |
1379 | #undef MIN | |
1380 | #undef IS_5GHZ | |
9ba9fa07 JM |
1381 | } |
1382 | ||
1383 | ||
41e650ae JM |
1384 | #ifdef CONFIG_WPS |
1385 | /* Compare function for sorting scan results when searching a WPS AP for | |
1386 | * provisioning. Return >0 if @b is considered better. */ | |
1387 | static int wpa_scan_result_wps_compar(const void *a, const void *b) | |
1388 | { | |
1389 | struct wpa_scan_res **_wa = (void *) a; | |
1390 | struct wpa_scan_res **_wb = (void *) b; | |
1391 | struct wpa_scan_res *wa = *_wa; | |
1392 | struct wpa_scan_res *wb = *_wb; | |
1393 | int uses_wps_a, uses_wps_b; | |
1394 | struct wpabuf *wps_a, *wps_b; | |
1395 | int res; | |
1396 | ||
1397 | /* Optimization - check WPS IE existence before allocated memory and | |
1398 | * doing full reassembly. */ | |
1399 | uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL; | |
1400 | uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL; | |
1401 | if (uses_wps_a && !uses_wps_b) | |
1402 | return -1; | |
1403 | if (!uses_wps_a && uses_wps_b) | |
1404 | return 1; | |
1405 | ||
1406 | if (uses_wps_a && uses_wps_b) { | |
1407 | wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE); | |
1408 | wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE); | |
1409 | res = wps_ap_priority_compar(wps_a, wps_b); | |
1410 | wpabuf_free(wps_a); | |
1411 | wpabuf_free(wps_b); | |
1412 | if (res) | |
1413 | return res; | |
1414 | } | |
1415 | ||
1416 | /* | |
1417 | * Do not use current AP security policy as a sorting criteria during | |
1418 | * WPS provisioning step since the AP may get reconfigured at the | |
1419 | * completion of provisioning. | |
1420 | */ | |
1421 | ||
1422 | /* all things being equal, use signal level; if signal levels are | |
1423 | * identical, use quality values since some drivers may only report | |
1424 | * that value and leave the signal level zero */ | |
1425 | if (wb->level == wa->level) | |
1426 | return wb->qual - wa->qual; | |
1427 | return wb->level - wa->level; | |
1428 | } | |
1429 | #endif /* CONFIG_WPS */ | |
1430 | ||
1431 | ||
aa820e02 JM |
1432 | static void dump_scan_res(struct wpa_scan_results *scan_res) |
1433 | { | |
76202aed | 1434 | #ifndef CONFIG_NO_STDOUT_DEBUG |
aa820e02 JM |
1435 | size_t i; |
1436 | ||
1437 | if (scan_res->res == NULL || scan_res->num == 0) | |
1438 | return; | |
1439 | ||
1440 | wpa_printf(MSG_EXCESSIVE, "Sorted scan results"); | |
1441 | ||
1442 | for (i = 0; i < scan_res->num; i++) { | |
1443 | struct wpa_scan_res *r = scan_res->res[i]; | |
1cbe86e2 | 1444 | u8 *pos; |
aa820e02 JM |
1445 | if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID)) |
1446 | == WPA_SCAN_LEVEL_DBM) { | |
1447 | int snr = r->level - r->noise; | |
1448 | wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d " | |
c5f10e80 JM |
1449 | "noise=%d level=%d snr=%d%s flags=0x%x " |
1450 | "age=%u", | |
aa820e02 JM |
1451 | MAC2STR(r->bssid), r->freq, r->qual, |
1452 | r->noise, r->level, snr, | |
c5f10e80 JM |
1453 | snr >= GREAT_SNR ? "*" : "", r->flags, |
1454 | r->age); | |
aa820e02 JM |
1455 | } else { |
1456 | wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d " | |
c5f10e80 | 1457 | "noise=%d level=%d flags=0x%x age=%u", |
aa820e02 | 1458 | MAC2STR(r->bssid), r->freq, r->qual, |
c5f10e80 | 1459 | r->noise, r->level, r->flags, r->age); |
aa820e02 | 1460 | } |
1cbe86e2 JM |
1461 | pos = (u8 *) (r + 1); |
1462 | if (r->ie_len) | |
1463 | wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len); | |
1464 | pos += r->ie_len; | |
1465 | if (r->beacon_ie_len) | |
1466 | wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs", | |
1467 | pos, r->beacon_ie_len); | |
aa820e02 | 1468 | } |
76202aed | 1469 | #endif /* CONFIG_NO_STDOUT_DEBUG */ |
aa820e02 JM |
1470 | } |
1471 | ||
1472 | ||
2c09af30 JM |
1473 | /** |
1474 | * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed | |
1475 | * @wpa_s: Pointer to wpa_supplicant data | |
1476 | * @bssid: BSSID to check | |
1477 | * Returns: 0 if the BSSID is filtered or 1 if not | |
1478 | * | |
1479 | * This function is used to filter out specific BSSIDs from scan reslts mainly | |
1480 | * for testing purposes (SET bssid_filter ctrl_iface command). | |
1481 | */ | |
d445a5cd JM |
1482 | int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s, |
1483 | const u8 *bssid) | |
1484 | { | |
1485 | size_t i; | |
1486 | ||
1487 | if (wpa_s->bssid_filter == NULL) | |
1488 | return 1; | |
1489 | ||
1490 | for (i = 0; i < wpa_s->bssid_filter_count; i++) { | |
1491 | if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid, | |
1492 | ETH_ALEN) == 0) | |
1493 | return 1; | |
1494 | } | |
1495 | ||
1496 | return 0; | |
1497 | } | |
1498 | ||
1499 | ||
1500 | static void filter_scan_res(struct wpa_supplicant *wpa_s, | |
1501 | struct wpa_scan_results *res) | |
1502 | { | |
1503 | size_t i, j; | |
1504 | ||
1505 | if (wpa_s->bssid_filter == NULL) | |
1506 | return; | |
1507 | ||
1508 | for (i = 0, j = 0; i < res->num; i++) { | |
1509 | if (wpa_supplicant_filter_bssid_match(wpa_s, | |
1510 | res->res[i]->bssid)) { | |
1511 | res->res[j++] = res->res[i]; | |
1512 | } else { | |
1513 | os_free(res->res[i]); | |
1514 | res->res[i] = NULL; | |
1515 | } | |
1516 | } | |
1517 | ||
1518 | if (res->num != j) { | |
1519 | wpa_printf(MSG_DEBUG, "Filtered out %d scan results", | |
1520 | (int) (res->num - j)); | |
1521 | res->num = j; | |
1522 | } | |
1523 | } | |
1524 | ||
1525 | ||
9ba9fa07 JM |
1526 | /** |
1527 | * wpa_supplicant_get_scan_results - Get scan results | |
1528 | * @wpa_s: Pointer to wpa_supplicant data | |
1529 | * @info: Information about what was scanned or %NULL if not available | |
1530 | * @new_scan: Whether a new scan was performed | |
1531 | * Returns: Scan results, %NULL on failure | |
1532 | * | |
1533 | * This function request the current scan results from the driver and updates | |
1534 | * the local BSS list wpa_s->bss. The caller is responsible for freeing the | |
1535 | * results with wpa_scan_results_free(). | |
1536 | */ | |
1537 | struct wpa_scan_results * | |
1538 | wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s, | |
1539 | struct scan_info *info, int new_scan) | |
1540 | { | |
1541 | struct wpa_scan_results *scan_res; | |
1542 | size_t i; | |
41e650ae | 1543 | int (*compar)(const void *, const void *) = wpa_scan_result_compar; |
9ba9fa07 | 1544 | |
17fbb751 | 1545 | scan_res = wpa_drv_get_scan_results2(wpa_s); |
9ba9fa07 | 1546 | if (scan_res == NULL) { |
f049052b | 1547 | wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results"); |
9ba9fa07 JM |
1548 | return NULL; |
1549 | } | |
c5f10e80 JM |
1550 | if (scan_res->fetch_time.sec == 0) { |
1551 | /* | |
1552 | * Make sure we have a valid timestamp if the driver wrapper | |
1553 | * does not set this. | |
1554 | */ | |
1555 | os_get_time(&scan_res->fetch_time); | |
1556 | } | |
d445a5cd | 1557 | filter_scan_res(wpa_s, scan_res); |
9ba9fa07 | 1558 | |
41e650ae JM |
1559 | #ifdef CONFIG_WPS |
1560 | if (wpas_wps_in_progress(wpa_s)) { | |
f049052b BG |
1561 | wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS " |
1562 | "provisioning rules"); | |
41e650ae JM |
1563 | compar = wpa_scan_result_wps_compar; |
1564 | } | |
1565 | #endif /* CONFIG_WPS */ | |
1566 | ||
9ba9fa07 | 1567 | qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *), |
41e650ae | 1568 | compar); |
aa820e02 | 1569 | dump_scan_res(scan_res); |
9ba9fa07 JM |
1570 | |
1571 | wpa_bss_update_start(wpa_s); | |
1572 | for (i = 0; i < scan_res->num; i++) | |
c5f10e80 JM |
1573 | wpa_bss_update_scan_res(wpa_s, scan_res->res[i], |
1574 | &scan_res->fetch_time); | |
9ba9fa07 JM |
1575 | wpa_bss_update_end(wpa_s, info, new_scan); |
1576 | ||
1577 | return scan_res; | |
1578 | } | |
1579 | ||
1580 | ||
2c09af30 JM |
1581 | /** |
1582 | * wpa_supplicant_update_scan_results - Update scan results from the driver | |
1583 | * @wpa_s: Pointer to wpa_supplicant data | |
1584 | * Returns: 0 on success, -1 on failure | |
1585 | * | |
1586 | * This function updates the BSS table within wpa_supplicant based on the | |
1587 | * currently available scan results from the driver without requesting a new | |
1588 | * scan. This is used in cases where the driver indicates an association | |
1589 | * (including roaming within ESS) and wpa_supplicant does not yet have the | |
1590 | * needed information to complete the connection (e.g., to perform validation | |
1591 | * steps in 4-way handshake). | |
1592 | */ | |
9ba9fa07 JM |
1593 | int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s) |
1594 | { | |
1595 | struct wpa_scan_results *scan_res; | |
1596 | scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0); | |
1597 | if (scan_res == NULL) | |
1598 | return -1; | |
1599 | wpa_scan_results_free(scan_res); | |
1600 | ||
1601 | return 0; | |
1602 | } | |
66fe0f70 DS |
1603 | |
1604 | ||
1605 | /** | |
1606 | * scan_only_handler - Reports scan results | |
1607 | */ | |
1608 | void scan_only_handler(struct wpa_supplicant *wpa_s, | |
1609 | struct wpa_scan_results *scan_res) | |
1610 | { | |
1611 | wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received"); | |
1612 | wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS); | |
1613 | wpas_notify_scan_results(wpa_s); | |
1614 | wpas_notify_scan_done(wpa_s, 1); | |
1615 | } |